CS5374 Datasheet | Cirrus Logic

Features - High Input Impedance Differential Amplifier - Ultra-low input bias: < 1 p A - Max signal amplitude: 5 Vpp differential Description The CS5374 bines two marine seismic analog measurement channels into one 7 mm x 7 mm QFN package. Each measurement channel consists of a high input impedance programmable gain differential amplifier that buffers analog signals into a high-performance, fourth-order ΔΣ modulator. The low-noise ΔΣ modulator converts the analog signal into a one-bit serial bit stream suitable for the CS5376A digital filter. Each amplifier has two sets of external inputs, INA and INB, to simplify system design as inputs from a hydrophone sensor or the CS4373A test DAC. An internal 800Ω termination can also be selected for noise tests. Gain settings are binary weighted (1x, 2x, 4x, 8x, 16x, 32x, 64x) and match the CS4373A test DAC output attenuation settings for full-scale testing at all gain ranges. Both the input multiplexer and gain are set by registers accessed through a standard SPI™ port. Each fourth-order ΔΣ modulator has very high dynamic range bined with low total harmonic distortion and low power consumption. It converts differential analog signals from the amplifier to an oversampled ΔΣ serial bit stream which is decimated by the CS5376A digital filter to a 24-bit output at the final output word rate. ORDERING INFORMATION See page 43. OUT1+ OUT1INR1- INF1- INF1+INR1+ VA- VA+ - Fourth Order Delta-Sigma (ΔΣ) Modulator - Signal Bandwidth: DC to 2 k Hz - mon mode rejection: 110 d B CMRR - Differential Analog Input, Digital ΔΣ Output - Multiplexed inputs: INA, INB, 800Ω termination - Selectable Gain: 1x, 2x, 4x, 8x, 16x, 32x, 64x - 1.5 μVpp between 0.1 Hz and 10 Hz - 11 n V / √Hz from 200 Hz to 2 k Hz - Excellent Amplifier Noise Performance - High Modulator Dynamic Range - 126 d B SNR @ 215 Hz BW (2 ms sampling) - 123 d B SNR @ 430 Hz BW (1 ms sampling) - Low Total Harmonic Distortion - - 118 d B THD typical (0.000126%) - - 108 d B THD maximum...